CN101340097A - Intelligent modularized reactive compensator - Google Patents
Intelligent modularized reactive compensator Download PDFInfo
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- CN101340097A CN101340097A CNA2008100620282A CN200810062028A CN101340097A CN 101340097 A CN101340097 A CN 101340097A CN A2008100620282 A CNA2008100620282 A CN A2008100620282A CN 200810062028 A CN200810062028 A CN 200810062028A CN 101340097 A CN101340097 A CN 101340097A
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Abstract
The invention relates to an intelligent modular reactive compensation device, comprising a main module. The main module comprises a main power supply unit, a data acquisition unit, a main control unit and a main communication unit; the main module also comprises two capacitance power supply input breakers, a silicon controlled power supply input breaker, a routing bus output breaker, a silicon controlled rectifier, a first work contactor, a first routing contactor, a second work contactor, a second routing contactor, a first capacitor and a second capacitor; the three-phase power supply of buses A, B and C is connected with the main power supply unit which is connected with the main control unit and the data acquisition unit. The main control unit is connected with the main communication unit, the silicon controlled rectifier, the first work contactor, the first routing contactor, the second work contactor and the second routing contactor. The invention provides the intelligent modular reactive compensation device which has the advantages of convenient installation, simple dilatancy and convenient maintenance.
Description
Technical field
The invention belongs to the low-voltage network field, relate in particular to a kind of reactive power compensator.
Background technology
The low-pressure reactive compensation system improves power factor by compensating power, reduces the wastage, improves quality of voltage, and raising equipment is exerted oneself, and then reaches object of energy saving, therefore extensive use in low-voltage network.
But present reactive compensation system is disperseed to form by multiple components and parts such as idle compensating control, circuit breaker, contactor, fuse, electric capacity, as Chinese patent CN03233221.1 (open day: 2004.02.25) proposed a kind of intelligent low-pressure reactive power compensator, by idle compensating control, distribution transformer monitoring electric energy meter; Air switch, A.C. contactor and capacitor etc. assemble, and this device components and parts are various, and the mounting process more complicated needs after coming into operation to expand that compensation capacity then must be reinstalled, design circuit structure, circuit and element again.And the capacitor switching device that adopts at present has three kinds of controllable silicon switching, contactor switching and solid-state relay switchings, and controllable silicon switching power consumption is big, and temperature rise is fragile; The contactor switching capacitance shoves greatly, and electrical network is impacted greatly, easily burns the contact; Solid-state relay when operation heating is serious, the time punch-through arranged.
Summary of the invention
The deficiency of, troublesome maintenance numerous and diverse for the mounting process complexity, the dilatation that overcome existing reactive power compensator, the invention provides a kind of easy for installation, dilatation simple, safeguard intelligent modularized reactive compensator easily.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of intelligent modularized reactive compensator comprises primary module, and described primary module comprises: be used for changing AC power into galvanic main power source unit; Be used to gather the data acquisition unit of the data of three-phase voltage, three-phase current, zero-sequence current and residual voltage; Be used for the reactive power according to the real time data computing system needs of gathering, complementary modulus piece, three-phase divide complementary modulus piece and primary module interior capacitor to make up the main control unit of switching altogether to select three-phase; Be used for dividing the main communication unit of complementary modulus piece communication with the common complementary modulus piece of three-phase, three-phase; Described primary module comprises also that two capacitor powers input skies are opened, thyristor supply input sky is opened, route bus output sky is opened, controllable silicon, the first work contactor, the first via be by contactor, the second work contactor, secondary route contactor, first capacitor, second capacitor; Bus A, B, C three phase mains are connected with the main power source unit, described main power source unit connects main control unit and data acquisition unit, and described main control unit connects main communication unit, controllable silicon, the first work contactor, the first via by contactor, second work contactor and the secondary route contactor; First capacitor is connected with the first work contactor by contactor with the first via, the first via is by the contactor and the first work contactor parallel connection, second capacitor is connected with the second work contactor with the secondary route contactor, the secondary route contactor and the second work contactor parallel connection, bus A, B, C three phase mains are opened respectively by two skies and are connected with the second work contactor with the first work contactor, the silicon controlled output is opened by route bus output sky and is inserted the route bus, and the silicon controlled output connects the first via by contactor and secondary route contactor simultaneously.
As preferred a kind of scheme: described intelligent modularized reactive compensator also comprises three-phase complementary modulus piece altogether, and described three-phase complementary modulus piece altogether comprises: be used for changing AC power into the galvanic power subsystem of mending altogether; Be used for selecting the three-phase common benefit control unit of the capacitor bank switching of complementary modulus piece altogether according to the control signal of primary module; Be used for common benefit communication unit with the primary module communication; Described three-phase complementary modulus piece altogether comprises that also the 3rd work contactor, the 4th work contactor, Third Road are by contactor, the 4th route contactor, the 3rd capacitor and the 4th capacitor;
The described power subsystem of mending altogether connects and to mend control unit altogether, and the described control unit of mending altogether connects and mends communication unit, the 3rd work contactor, the 4th work contactor, Third Road altogether by contactor and the 4th route contactor; The 3rd capacitor is connected with the 3rd work contactor by contactor with Third Road, Third Road is by contactor and the 3rd work contactor parallel connection, the 4th capacitor is connected with the 4th work contactor with the 4th route contactor, the 4th route contactor and the 4th work contactor parallel connection, bus A, B, C three phase mains are opened respectively by two skies and are connected with the 4th work contactor with the 3rd work contactor, and the route bus of primary module is connected with the 4th route contactor by contactor with Third Road by mending the route input switch altogether.
As preferred another scheme: described intelligent modularized reactive compensator comprises that also three-phase divides the complementary modulus piece, and described three-phase divides the complementary modulus piece to comprise: be used for changing AC power into galvanic branch and mend power subsystem; Be used for selecting three-phase to divide the branch of the capacitor bank switching of complementary modulus piece to mend control unit according to the control signal of primary module; Be used for mending communication unit with the branch of primary module communication; Described three branch complementary modulus pieces also comprise the 5th work contactor, the 6th work contactor, the 7th work contactor, the 5th route contactor and phase splitting compensation capacitor;
Described branch is mended power subsystem connection branch and is mended control unit, and described branch is mended control unit and connected branch benefit communication unit, the 5th work contactor, the 6th work contactor, the 7th work contactor and the 5th route contactor; Three-phase divides the benefit capacitor to be connected with the 5th route contactor and the 5th work contactor, the 6th work contactor, the 7th work contactor, the 5th work contactor, the 6th work contactor, the 7th work contactor and the 5th route contactor parallel connection, bus A, B, C three phase mains are opened respectively by three skies and are connected with the 5th work contactor, the 6th work contactor and the 7th work contactor, the route bus of primary module is connected with the 5th route contactor by dividing benefit route input switch, and the zero line of distribution source transmission line is directly mended capacitor with the three-phase branch and is connected.
Further, described intelligent modularized reactive compensator comprises 1～100 three-phase complementary modulus piece altogether, and three-phase is parallel with one another between the complementary modulus piece altogether.
Further, described intelligent modularized reactive compensator comprises that 1～100 three-phase divides the complementary modulus piece, and three-phase divides between the complementary modulus piece parallel with one another.
Further again, described intelligent modularized reactive compensator comprises that 1～100 three-phase divides the complementary modulus piece, and three-phase divides between the complementary modulus piece parallel with one another, and described three-phase divides complementary modulus piece and three-phase parallel with one another between the complementary modulus piece altogether.
Further, described primary module also comprises demonstration main operation unit, and described demonstration main operation unit connects main control unit; Described three-phase altogether complementary modulus piece comprises that also demonstration mends operating unit altogether, and described demonstration is mended operating unit altogether and connected and mend control unit altogether; Described three-phase divides the complementary modulus piece also to comprise and shows that dividing benefit operating unit, described demonstration to divide the benefit operating unit to connect divides the benefit control unit.Display floater has information such as power supply indication, communication indication, capacitor switching indication, faulty indication, can show intelligent powerless compensation module operating mode in real time.
Described each capacitor connects the miniature circuit breaker protective device that is used for playing overload protective function when overcurrent.Circuit breaker is as the electric capacitor appliance mains switch.
Described main control unit comprises the active detecting subelement that is used for overvoltage, under-voltage, phase shortage, overcurrent, excess temperature, low temperature and over current fault are carried out active detecting.Automatically no longer drop into power capacitor when fault reaches the first class of protection condition, automatic excision has dropped into power capacitor when fault reaches the second class protection condition, prolongs the intelligent powerless compensation module life.
Described main control unit, mend control unit and divide to mend control unit and include and be used for detecting in real time the whether electric capacity operating mode detection sub-unit of normal switching and electric capacitance change of capacitor altogether.
Technical conceive of the present invention is: adopt modular construction, the user compensates total amount as required and selects the common complementary modulus piece of three-phase, three-phase to divide the complementary modulus number of blocks, with the direct system that promptly forms in parallel of itself and primary module.The primary module module is divided the complementary modulus piece by communication bus interface control, the common complementary modulus piece of management three-phase, three-phase, accepts background computer " remote signalling, remote regulating, remote control, remote measurement " by port.After system formed, the intelligent powerless compensation module detected automatically to module capacity, as long as divide the complementary modulus piece to be connected with the primary module communication the common complementary modulus piece of three-phase, three-phase, but primary module need not to reset with regard to module capacity in the automatic checkout system.The user need adjust the compensation total amount, if with three-phase altogether complementary modulus piece, three-phase divide the complementary modulus number of blocks to increase and decrease, complementary modulus piece, three-phase divide the complementary modulus piece or remove original module and can finish three-phase directly in parallel new in original system altogether.Intelligent powerless compensation module one cover by a primary module and N platform three-phase altogether complementary modulus piece, three-phase divide the complementary modulus piece to form, N is 100 to the maximum, the common complementary modulus piece of three-phase, three-phase divide the complementary modulus piece can not break away from primary module to work independently.Power capacitor in the intelligent powerless compensation module can be according to the actual selection capacity.
Switching adopts contactless route switching, shared three controllable silicons of a cover intelligent powerless compensation module.Each power capacitor all is furnished with a sky and opens protection; each three-phase is mended power capacitor altogether and is formed contactless route switching by a work contactor, route contactor and primary module controllable silicon, and each three-phase divides to be mended power capacitor totally three work contactors and primary module controllable silicon are formed contactless route switching by the every work contactor mutually of a route contactor and A, B, C.When three-phase is mended the capacitor input altogether, the adhesive of route contactor elder generation, conducting when controllable silicon is zero at voltage, the conducting again of work contactor, controllable silicon shutoff when electric current is zero then, last route contactor disconnects; When three-phase is mended the capacitor excision altogether, the adhesive of route contactor elder generation, conducting when controllable silicon is zero at voltage, the work contactor disconnects again, and controllable silicon turn-offs when electric current is zero then, and last route contactor disconnects.Three-phase divides when mending the capacitor input, the adhesive of route contactor elder generation, need to drop into a phase, two-phase or the three-phase controllable silicon conducting when voltage is zero of A, B, C, need a phase, two-phase or the conducting again of three-phase work contactor of input, controllable silicon turn-offs when electric current is zero then, and last route contactor disconnects; Three-phase divides when mending the capacitor excision, the adhesive of route contactor elder generation needs a phase, two-phase or the three-phase controllable silicon conducting when voltage is zero of excision, needs a phase, two-phase or the three-phase work contactor of excision to disconnect again, controllable silicon turn-offs when electric current is zero then, and last route contactor disconnects.
Switching adopts Intelligent Control Theory according to fuzzy control theory Intelligence Selection capacitor bank, switching capacitance compensation in time automatically, compensating power capacity.Primary module main control unit analyzing and processing real time data computing system is required idle, with the reactive power is the control physical quantity, the power factor of setting with the user is that switching is with reference to limiting the quantity of, the Intelligence Selection capacitor bank, switching capacitance compensation in time automatically, compensating power capacity, big or small Intelligence Selection capacitor bank according to each phase reactive power in the distribution system three-phase, principle according to " polishing of making even " drops into electrical network, realizes the Based Intelligent Control of capacitor switching, and compensation precision is improved.
Primary module is ordered to the reactive compensation module transmitting-receiving by communication bus, after the common complementary modulus piece of three-phase, three-phase divide the complementary modulus piece to receive order, carry out discriminatory analysis through main control unit, send control command, control route contactor cooperates with the primary module controllable silicon with disconnection with the adhesive of work contactor, reaches the purpose that drops into or excise electric capacity.Primary module is gathered data such as three-phase voltage, three-phase current, zero-sequence current, residual voltage by data acquisition unit, send the main control unit analyzing and processing to through signal conditioning circuit, A/D conversion, main control unit sends control, demonstration, communications command by analyzing, handling.
The intelligent powerless compensation module all has initiatively defencive function.Control by main control unit CPU; can carry out active detecting to faults such as overvoltage, under-voltage, phase shortage, overcurrent, excess temperature, low temperature, overcurrents; when reaching the first class of protection condition, fault no longer drops into power capacitor automatically; automatic excision has dropped into power capacitor when fault reaches the second class protection condition, prolongs the intelligent powerless compensation module life.
Beneficial effect of the present invention mainly shows: easy for installation, dilatation is simple, it is convenient to safeguard.
Description of drawings
Fig. 1 is the schematic diagram of intelligent modularized reactive compensator of the present invention.
Fig. 2 is the circuit diagram of intelligent modularized reactive compensator.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1, Fig. 2, a kind of intelligent modularized reactive compensator, described intelligent modularized reactive compensator comprises primary module 1, described primary module 1 comprises: be used for changing AC power into galvanic main power source unit 11; Be used to gather the data acquisition unit 12 of the data of three-phase voltage, three-phase current, zero-sequence current and residual voltage; Be used for the reactive power according to the real time data computing system needs of gathering, complementary modulus piece, three-phase divide complementary modulus piece and primary module interior capacitor to make up the main control unit 13 of switching altogether to select three-phase; Be used for dividing the main communication unit 15 of complementary modulus piece communication with the common complementary modulus piece of three-phase, three-phase; Described primary module comprises also that two capacitor powers input skies open 16,19, thyristor supply input sky opens 17, route bus output sky opens 18, controllable silicon 110,111,112, the first work contactor 113, the first via be by contactor 114, the second work contactor 116, secondary route contactor 115, the first capacitors 117, second capacitor 118; Bus A, B, C three phase mains are connected with main power source unit 1, described main power source unit 11 connects main control unit 13 and data acquisition unit 12, and described main control unit 13 connects main communication unit 15, controllable silicon 110,111,112, the first work contactor 113, the first via by contactor 114, second work contactor 116 and the secondary route contactor 115; First capacitor 117 is connected with the first work contactor 113 by contactor 114 with the first via, the first via is by contactor 114 and 113 parallel connections of the first work contactor, second capacitor 118 is connected with the second work contactor 116 with secondary route contactor 115, secondary route contactor 115 and 116 parallel connections of the second work contactor, bus A, B, the C three phase mains opens 16 by two skies, 19 are connected with the second work contactor 116 with the first work contactor 113 respectively, the silicon controlled output is opened 18 by route bus output sky and is inserted the route bus, and the silicon controlled output connects the first via by contactor 114 and secondary route contactor 115 simultaneously.
Described intelligent modularized reactive compensator also comprises three-phase complementary modulus piece 2 altogether, and described three-phase complementary modulus piece 2 altogether comprises: be used for changing AC power into the galvanic power subsystem 21 of mending altogether; Be used for selecting the three-phase common benefit control unit 22 of the capacitor bank switching of complementary modulus piece altogether according to the control signal of primary module; Be used for common benefit communication unit 24 with the primary module communication; Described three-phase complementary modulus piece altogether comprises that also the 3rd work contactor 28, the 4th work contactor 211, Third Road are by contactor 29, the 4th route contactor 210, the 3rd capacitor 212 and the 4th capacitor 213; The described power subsystem 21 mended altogether connects and mends control unit 22 altogether, and the described control unit 22 of mending altogether connects and mends communication unit 24, the 3rd work contactor 28, the 4th work contactor 211, Third Road altogether by contactor 29 and the 4th route contactor 210; The 3rd capacitor 212 connects 28 with Third Road by contactor 29 and the 3rd work contactor and connects, Third Road is by contactor 29 and 28 parallel connections of the 3rd work contactor, the 4th capacitor 213 is connected with the 4th work contactor 211 with the 4th route contactor 210, the 4th route contactor 211 and 210 parallel connections of the 4th work contactor, bus A, B, the C three phase mains opens 25 by two skies, 27 are connected with the 4th work contactor 211 with the 3rd work contactor 28 respectively, and the route bus of primary module is connected with the 4th route contactor 210 by contactor 29 with Third Road by mending route input switch 26 altogether.
Described intelligent modularized reactive compensator comprises that also three-phase divides complementary modulus piece 3, and described three-phase divides complementary modulus piece 3 to comprise: be used for changing AC power into galvanic branch and mend power subsystem 31; Be used for selecting three-phase to divide the branch of the capacitor bank switching of complementary modulus piece to mend control unit 32 according to the control signal of primary module; Be used for mending communication unit 34 with the branch of primary module communication; Described three branch complementary modulus pieces also comprise the 5th work contactor 37, the 6th work contactor 38, the 7th work contactor 39, the 5th route contactor 310 and phase splitting compensation capacitor 311; Described branch is mended power subsystem 31 connection branches and is mended control unit 32, and described branch is mended control unit 32 and connected branch benefit communication unit 34, the 5th work contactor 37, the 6th work contactor 38, the 7th work contactor 39 and the 5th route contactor 310; Three-phase divides mends capacitor 311 and the 5th route contactor 310 and the 5th work contactor 27, the 6th work contactor 28, the 7th work contactor 29 connects, the 5th work contactor 27, the 6th work contactor 28, the 7th work contactor 29 and 310 parallel connections of the 5th route contactor, bus A, B, the C three phase mains by three skies open 35 respectively with the 5th work contactor 27, the 6th work contactor 28, the 7th work contactor 29 connects, the route bus of primary module is connected with the 5th route contactor 310 by dividing benefit route input switch, and the zero line of distribution source transmission line is directly mended capacitor 311 with the three-phase branch and is connected.
Described intelligent modularized reactive compensator comprises 1～100 three-phase complementary modulus piece altogether, and three-phase is parallel with one another between the complementary modulus piece altogether, and the complementary modulus piece is all in parallel with primary module altogether for each three-phase.
Described intelligent modularized reactive compensator comprises that 1～100 three-phase divides the complementary modulus piece, and three-phase divides between the complementary modulus piece parallel with one another, and each three-phase divides the complementary modulus piece all in parallel with primary module.
Described intelligent modularized reactive compensator comprises that 1～100 three-phase divides the complementary modulus piece, three-phase divides between the complementary modulus piece parallel with one another, described three-phase divides complementary modulus piece and three-phase parallel with one another between the complementary modulus piece altogether, and three-phase divides the complementary modulus piece, and the complementary modulus piece is all in parallel with primary module altogether with three-phase.
Described primary module also comprises demonstration main operation unit 14, and described demonstration main operation unit 14 connects main control units; Described three-phase altogether complementary modulus piece comprises that also demonstration mends operating unit altogether, and described demonstration is mended operating unit altogether and connected and mend control unit altogether; Described three-phase divides the complementary modulus piece also to comprise and shows that dividing benefit operating unit, described demonstration to divide the benefit operating unit to connect divides the benefit control unit.Display floater has information such as power supply indication, communication indication, capacitor switching indication, faulty indication, can show intelligent powerless compensation module operating mode in real time.
Described each capacitor connects the miniature circuit breaker protective device that is used for playing overload protective function when overcurrent.Circuit breaker is as the electric capacitor appliance mains switch.
Described main control unit comprises the active detecting subelement that is used for overvoltage, under-voltage, phase shortage, overcurrent, excess temperature, low temperature and over current fault are carried out active detecting.Automatically no longer drop into power capacitor when fault reaches the first class of protection condition, automatic excision has dropped into power capacitor when fault reaches the second class protection condition, prolongs the intelligent powerless compensation module life.
Described main control unit, mend control unit and divide to mend control unit and include and be used for detecting in real time the whether electric capacity operating mode detection sub-unit of normal switching and electric capacitance change of capacitor altogether.
Primary module 1 and N platform three-phase altogether complementary modulus piece 2, N platform three-phase divide complementary modulus piece 3 in parallel individually or simultaneously use form promptly that three-phase is mended altogether, three-phase divides and mends and mend altogether and three kinds of reactive power compensation patterns of mixed compensation of dividing benefit to combine, N is a natural number, N is 100 to the maximum.Main power source unit 11, data acquisition unit 12, show that main operation unit 14, main control unit 13, main communication unit 15, capacitor power input sky open 16 and 19, thyristor supply input sky opens 17, the route bus exports that sky opens 18, controllable silicon 110,111,112, the first work contactor 113, the first via all are integrated in primary module 1 inside by all components and parts such as contactor 114, the second work contactor 116, secondary route contactor 115, the first electric capacity 117, second electric capacity 118.Mend altogether power subsystem 21, altogether mend control unit 22, show mend operating unit 23 altogether, mend that communication unit 24, capacitor power input sky open 25,27, route input sky is driven the 26, the 3rd work contactor 28 altogether, the 4th work contactor 211, Third Road all be integrated in three-phase complementary modulus piece 2 inside altogether by contactor 29, the 4th route contactor 210, the 3rd electric capacity 212, the 4th electric capacity 213.Branch benefit power subsystem 31, divide to mend control unit 32, show divide mend operating unit 33, divide mend that communication unit 34, capacitor power input sky open 35, route input sky is driven the 36, the 5th work contactor 37, the 6th work contactor 38, the 7th work contactor 39, the 5th route contactor 310, phase splitting compensation electric capacity 311 all be integrated in three-phase and divide complementary modulus piece inside.The intelligent powerless compensation module is opened connecting system power supply A in parallel, B, C, N by sky, carrying out switching by the route bus cooperates, by communication bus transmitting-receiving order, system adopts modular construction, the user compensates total amount as required and selects compensating module quantity, with the direct system that promptly forms in parallel of itself and primary module, primary module divides the complementary modulus piece by communication bus interface control, the common complementary modulus piece of management three-phase, three-phase, accepts background computer " remote signalling, remote regulating, remote control, remote measurement " by port.After system formed, the user need adjust the compensation total amount, as long as reactive compensation module quantity is increased and decreased, and directly in parallel new reactive compensation module or remove original unnecessary reactive compensation module and can finish in original system.
Primary module 1 divides complementary modulus piece 3 to be connected through communication bus and the common complementary modulus piece 2 of three-phase with three-phase by main communication unit 15, and three-phase is total to complementary modulus piece 2 and three-phase divides complementary modulus piece 3 to accept primary module 1 order, send data through communication unit 24,34 by communication bus.With the reactive power is the control physical quantity, the intelligent compensation reactive power.Primary module 1 comprises main power source unit 11, data acquisition unit 12, shows main operation unit 14, main control unit 13, main communication unit 15, capacitor power input sky open 16 and 19, thyristor supply input sky opens 17, route bus output sky opens 18, controllable silicon 110,111,112, the first work contactor 113, the first via are by contactor 114, the second work contactor 116, secondary route contactor 115, the first electric capacity 117, second electric capacity 118.Power subsystem changes AC power 5V, 12V direct-current power supply main control unit 13, main communication unit 15, data acquisition unit 12 into, shows that main operation unit 14 is as working power.The data that data acquisition unit 12 is gathered three-phase voltage, three-phase current, zero-sequence current and residual voltage send main control unit 13 analyzing and processing to through signal condition and A/D conversion; Main control unit 13 is according to the reactive power of the real time data computing system needs of gathering, and Intelligence Selection three-phase complementary modulus piece 2, three-phase altogether divides complementary modulus piece 3 and primary module 1 internal capacitor combination switching.Each power capacitor 117 in the primary module, 118 and route contactors 114,115 and work contactors 113,116 connect, bus A, B, the C three phase mains opens 16 by sky, 19 insert primary module 1 and work contactor 113,116 connect, route contactor 114,115 are connected on controllable silicon 110,111,112 outputs and capacitor 117,118 connect, work contactor 113,116 with controllable silicon 110,111,112 in parallel and power capacitors 117,118 connect, main control unit 13 and controllable silicon 110,111,112 connect, and control controllable silicon 110 by the pulse triggering signal that main control unit 13 provides, 111,112 conductings and cut-out.Three-phase altogether the complementary modulus piece for inner integrated common benefit power subsystem 21, altogether mend control unit 22, show and mend operating unit 23 altogether, mend that communication unit 24, capacitor power input sky open 25,27, route input sky is opened the 26, the 3rd work contactor 28, the 4th work contactor 211, Third Road by elements such as contactor 29, the 4th route contactor 210, the 3rd electric capacity 212, the 4th electric capacity 213 altogether, mend altogether power subsystem 21 with AC power change into 5V, 12V direct-current power supply mend altogether control unit 22, altogether mend communication unit 24, show that main operation unit 14 is as working power.Each three-phase is mended power capacitor 212 altogether, 213 and Third Roads are by contactor 29, the 4th route contactor 210 and one the 3rd work contactor 28, the 4th work contactor 211 connects, bus A, B, the C three phase mains opens 25 by sky, 27 insert three-phase complementary modulus piece 2 and the 3rd work contactor 28 altogether, the 4th work contactor 211 connects, the 3rd work contactor 28, the 4th work contactor 211 and Third Road are by contactor 29, the 4th route contactor 210 in parallel and power capacitors 212,213 connect, primary module controllable silicon 110,111,112 outputs insert the route bus by route output switch 18, the route bus by three-phase altogether complementary modulus piece route input switch 26 and Third Road by contactor 29, the 4th route contactor 210 connects, and Third Road is by contactor 29, the 4th route contactor 210 is mended power capacitor 212 altogether with three-phase, 213 connect.Three-phase divides the complementary modulus piece to mend power subsystem 31 and change AC power into 5V, 12V direct-current power supply and divide and mend control unit 32, divide and mend communication unit 34, show to divide and mend operating unit 33 as working power for mending power subsystem 31, divide and mend control unit 32, show to divide and mend operating unit 33, divide and mend that communication unit 34, capacitor power input sky open 35, route input sky is opened elements such as the 36, the 5th work contactor 37, the 6th work contactor 38, the 7th work contactor 39, the 5th route contactor 310, phase splitting compensation electric capacity 311 inner integrated the branch, dividing.A three-phase divides mends power capacitor 311 and one the 5th route contactor 310 and three the 5th work contactors 37, the 6th work contactor 38, the 7th work contactor 39 connects, bus A, B, c-power supply leaves 35 access three-phases by sky and divides complementary modulus piece and the 5th work contactor 37, the 6th work contactor 38, the 7th work contactor 39 connects, the 5th work contactor 37, the 6th work contactor 38, the 7th work contactor 39 divides benefit power capacitor 311 to be connected with 310 parallel connections of the 5th route contactor and three-phase, primary module controllable silicon 110,111,112 outputs insert the route bus by route output switch 18, the route bus divides complementary modulus piece route input switch 36 to be connected with the 5th route contactor 310 by three-phase, the 5th route contactor 310 divides benefit power capacitor 311 to be connected with three-phase, and power supply N directly divides benefit capacitor N to be connected with three-phase.Intelligent powerless compensation module 1,2,3 all has initiatively defencive function.Control by main control unit; can carry out active detecting to faults such as overvoltage, under-voltage, phase shortage, overcurrent, excess temperature, low temperature, overcurrents; when reaching the first class of protection condition, fault no longer drops into power capacitor automatically; automatic excision has dropped into power capacitor when fault reaches the second class protection condition, prolongs the intelligent powerless compensation module life.The intelligent powerless compensation module faceplate has information such as power supply indication, communication indication, capacitor switching indication, faulty indication, can show intelligent powerless compensation module operating mode in real time.
Switching of the present invention is according to fuzzy control theory Intelligence Selection capacitor bank,, adopt Intelligent Control Theory, switching capacitance compensation in time automatically, compensating power capacity.Primary module main control unit analyzing and processing real time data computing system is required idle, with the reactive power is the control physical quantity, the power factor of setting with the user is that switching is with reference to limiting the quantity of, the Intelligence Selection capacitor bank, switching capacitance compensation in time automatically, compensating power capacity, big or small Intelligence Selection capacitor bank according to each phase reactive power in the distribution system three-phase, principle according to " polishing of making even " drops into electrical network, realizes the Based Intelligent Control of capacitor switching, and compensation precision is improved.
Operation principle of the present invention is as follows:
When (1) three-phase need drop into reactive power compensation simultaneously
Gather data such as three-phase voltage, three-phase current, zero-sequence current, residual voltage when primary module 1 by data acquisition unit 12, be converted to digital signal and pass to main control unit 13 analyzing and processing through signal condition, A/D.
Judge when needing three-phase to drop into reactive power compensation simultaneously, primary module 1 will have the route contactor input order of address code through main communication unit 15, send to corresponding three-phase complementary modulus piece 2 altogether by control bus, corresponding three-phase is total to complementary modulus piece 2 by mending the order of communication unit 24 transmitting-receiving primary modules 1 altogether.
Three-phase is total to route contactor 29 or 210 power supplys of complementary modulus piece main control unit 2 according to the route contactor input order conducting primary module order request conducting of primary module 1, route contactor coil power turn-on, drive contact closure, route contactor 29 or 210 closures, because route contactor 29 or 210 and no primary module module 1 in controllable silicon 110,111,112 connect, for controllable silicon 110,111,112 provides path and anode voltage, promptly provide the controllable silicon turn-on condition after route contactor 29 or 210 contact closure.
Route contactor 29 or the 210 normal back reactive compensation module 2 transmission signals that drop into send to primary module by mending communication unit 24 altogether, after primary module 1 detects the correct input of corresponding route contactor, main control unit 13 sends and drops into order controllable silicon 110,111,112, start pulse signal conducting controllable silicon 110,111,112, controllable silicon drops into when voltage is zero, guiding path provides reactive power compensation by the self- healing power capacitor 117 or 118 of contactor 29 or 210 correspondences to system;
When electric capacity 117 or 118 and power turn-on after, primary module 1 sends the work contactor input that has address code and orders reactive compensation module 2 to correspondence, control command sends to compensating module 2 through main communication unit 15 and mends communication unit 24 altogether, after mending control unit 22 analyzing and processing altogether, three-phase is total to complementary modulus piece main control unit 2 according to the work contactor 28 of the route contactor input order conducting primary module order request conducting of primary module 1 or 211 power supply, route contactor 28 or 211 coil power conductings, drive contact closure, route contactor 28 or 211 closures, because work contactor 28 or 211 and primary module 1 in controllable silicon 110,111,112 parallel connections, the conducting of controllable silicon this moment, contactor 28 or 211 contact closure of therefore working can not produce shoves.
Power interface tentaculum 28 or the 211 normal back reactive compensation module 2 transmission signals that drop into send to primary module 1 by mending communication unit 24 altogether, after primary module 1 detects the power interface tentaculum 28 or 211 correct inputs that needs to drop into, main control unit 13 sends and interrupts the conducting order to controllable silicon 110,111,112, controllable silicon 110,111,112 turn-off when electric current is zero, primary module 1 orders the route contactor 29 or 210 of conducting to disconnect again, the back reactive compensation module 2 that receives orders is mended control unit 22 altogether and is disconnected corresponding route contactor 29 or 210 coil powers, the route contactor disconnects, because of the adhesive of work contactor 28 or 211, so the self-healing power capacitor 212 that has dropped into or 213 continues to provide reactive power compensation can not disconnect to system.
When (2) three-phase need excise reactive power compensation simultaneously
Gather data such as three-phase voltage, three-phase current, zero-sequence current, residual voltage when primary module 1 by data acquisition unit 12, be converted to digital signal and pass to main control unit 13 analyzing and processing through signal condition, A/D.
Judge when needing three-phase to cut reactive power compensation simultaneously, primary module 1 will have the route contactor input order of address code through main communication unit 15, send to corresponding three-phase complementary modulus piece 2 altogether by control bus, corresponding three-phase is total to complementary modulus piece 2 by mending the order of communication unit 24 transmitting-receiving primary modules 1 altogether.
Three-phase is total to route contactor 29 or 210 power supplys of complementary modulus piece main control unit 2 according to the route contactor input order conducting primary module order request conducting of primary module 1, route contactor coil power turn-on, drive contact closure, route contactor 29 or 210 closures, because route contactor 29 or 210 and no primary module module 1 in controllable silicon 110,111,112 connect, for controllable silicon 110,111,112 provides path and anode voltage, promptly provide the controllable silicon turn-on condition after route contactor 29 or 210 contact closure.
Route contactor 29 or the 210 normal back reactive compensation module 2 transmission signals that drop into send to primary module by mending communication unit 24 altogether, after primary module 1 detects the correct input of corresponding route contactor, main control unit 13 sends and drops into order controllable silicon 110,111,112, start pulse signal conducting controllable silicon 110,111,112, controllable silicon drops into when voltage is zero, guiding path provides reactive power compensation by the self- healing power capacitor 117 or 118 of contactor 29 or 210 correspondences to system;
When electric capacity 117 or 118 and power turn-on after, primary module 1 sends the work contactor that has address code and excises the reactive compensation module 2 of order to correspondence, control command sends to the common complementary modulus piece 2 of three-phase through main communication unit 15 and mends communication unit 24 altogether, after mending control unit 22 analyzing and processing altogether, three-phase complementary modulus piece is altogether mended work contactor 28 or the work contactor 28 of 211 excision order disconnection primary module order requests disconnections or 211 the power supply of control unit 22 according to primary module 1 altogether, work contactor 28 or 211 coil powers disconnect, the promotion contact discharges, work contactor 28 or 211 disconnects, because work contactor 28 or 211 and primary module 1 in controllable silicon 110,111,112 parallel connections, the conducting of controllable silicon this moment, power capacitor continues in parallel with power-supply system, and therefore work contactor 28 or 211 contacts disconnect can not producing and shove or overvoltage.
Three-phases were total to complementary modulus piece 2 transmission signals and send to primary module 1 by mending communication unit 24 altogether after the contactor 28 or 211 of working normally excised, after primary module 1 detects the power interface tentaculum 28 or 211 correct excisions that needs excision, main control unit 13 sends and interrupts the conducting order to controllable silicon 110,111,112, controllable silicon 110,111,112 turn-offs when electric current is zero, the contactor of working this moment disconnects, therefore the self- healing power capacitor 212 or 213 that drops into is opened from system break, and reactive power compensation no longer is provided.Primary module 1 orders the route contactor 29 or 210 of conducting to disconnect again, and the back three-phase that receives orders is total to complementary modulus piece 2 and mends route contactor 29 or 210 coil powers that control unit 22 disconnects correspondence altogether, and the route contactor disconnects.
When (3) three-phase needs independent choosing to drop into reactive power compensation mutually
Gather data such as three-phase voltage, three-phase current, zero-sequence current, residual voltage when primary module 1 by data acquisition unit 12, be converted to digital signal and pass to main control unit 13 analyzing and processing through signal condition, A/D.
Judge when three-phase needs independent choosing to drop into reactive power compensation mutually, primary module 1 will have the route contactor input order of address code through main communication unit 15, send to corresponding three-phase by control bus and divide complementary modulus piece 3, corresponding three-phase divides complementary modulus piece 3 by dividing the order of mending communication unit 34 transmitting-receiving primary modules 1.
Three-phase divides five route contactor 310 power supplys of complementary modulus piece main control unit 3 according to the route contactor input order conducting primary module order request conducting of primary module 1, route contactor coil power turn-on, drive contact closure, the 5th route contactor 310 closures, because 110,111,112 series connection of the controllable silicon in the 5th route contactor 310 and the primary module 1, for controllable silicon 110,111,112 provides path and anode voltage, promptly provide the controllable silicon turn-on condition after the 5th route contactor 310 contact closure.
The 5th route contactor 310 normal back three-phases that drop into divide complementary modulus piece 3 transmission signals to send to primary module by a minute benefit communication unit 34, after primary module 1 detects the correct input of corresponding route contactor, main control unit 13 sends and drops into order drops into phase to needs controllable silicon 110 or 111 or 112, the start pulse signal conducting need drop into the controllable silicon 110 or 111 or 112 of phase, controllable silicon drops into when voltage is zero, the conducting three-phase corresponding with controllable silicon divides the single-phase capacitance of mending self-healing power capacitor 311, provides reactive power compensation to system;
Behind electric capacity 311 and power turn-on, primary module 1 sends the work contactor input that has address code orders the three-phase to correspondence to divide complementary modulus piece 3, control command sends to three-phase through main communication unit 15 and divides the complementary modulus piece to mend communication unit 34 in 3 minutes, after undue benefit control unit 32 analyzing and processing, three-phase divides the complementary modulus piece to mend control unit 32 in 3 minutes according to the work contactor 37 of the work contactor input order conducting primary module order request conducting of primary module 1 or 38 or 39 power supply, work contactor 37 or 38 or 39 coil power conductings, drive contact closure, work contactor 37 or 38 or 39 closures, because work contactor 37 38 or 39 and primary module 1 in controllable silicon 110,111,112 parallel connections, the conducting of controllable silicon this moment, contactor 37 or 38 or 39 contact closure of therefore working can not produce shoves.
Three-phases divide complementary modulus piece 3 transmission signals to send to primary module 1 by a minute benefit communication unit 34 after contactor 37 or the 38 or 39 normal inputs of working, after primary module 1 detects the work contactor 37 or 38 or 39 correct inputs that needs to drop into, main control unit 13 sends and interrupts the conducting order to controllable silicon 110,111,112, controllable silicon 110,111,112 turn-off when electric current is zero, primary module 1 orders the 5th route contactor 310 of conducting to disconnect again, the back three-phase that receives orders divides the complementary modulus piece to mend the 5th route contactor 310 coil powers that control unit 32 disconnects correspondence in 3 minutes, the route contactor disconnects, because of work contactor 37 or 38 or 39 adhesives,, self-healing power capacitor 311 continuation that dropped into provide reactive power compensation can not disconnect mutually so independently selecting to system.
When (4) three-phase needs independent choosing to excise reactive power compensation mutually
Gather data such as three-phase voltage, three-phase current, zero-sequence current, residual voltage when primary module 1 by data acquisition unit 12, be converted to digital signal and pass to main control unit 13 analyzing and processing through signal condition, A/D.
Judge when three-phase needs independent choosing to excise reactive power compensation mutually, primary module 1 will have the route contactor input order of address code through main communication unit 15, send to corresponding three-phase by control bus and divide complementary modulus piece 3, corresponding three-phase divides complementary modulus piece 3 by dividing the order of mending communication unit 34 transmitting-receiving primary modules 1.
Three-phase divides five route contactor 310 power supplys of complementary modulus piece main control unit 3 according to the route contactor input order conducting primary module order request conducting of primary module 1, route contactor coil power turn-on, drive contact closure, the 5th route contactor 310 closures, because controllable silicon 110,111,112 series connection in the 5th route contactor 310 and the no primary module module 1, for controllable silicon 110,111,112 provides path and anode voltage, promptly provide the controllable silicon turn-on condition after the 5th route contactor 310 contact closure.
The 5th route contactor 310 normal back three-phases that drop into divide complementary modulus piece 3 transmission signals to send to primary module by a minute benefit communication unit 34, after primary module 1 detects the correct input of corresponding route contactor, main control unit 13 sends and drops into order drops into phase to needs controllable silicon 110 or 111 or 112, the start pulse signal conducting need be excised the controllable silicon 110 or 111 or 112 of phase, controllable silicon drops into when voltage is zero, and work this moment contactor and controllable silicon are in conducting state simultaneously.
Primary module 1 sends the work contactor ON-and OFF-command that has address code and divides complementary modulus piece 3 to the three-phase of correspondence, control command sends to three-phase through main communication unit 15 and divides the complementary modulus piece to mend communication unit 34 in 3 minutes, after undue benefit control unit 32 analyzing and processing, three-phase divides the complementary modulus piece to mend control unit 32 in 3 minutes according to the work contactor 37 of the work contactor excision order disconnection primary module order request disconnection of primary module 1 or 38 or 39 power supply, work contactor 37 or 38 or 39 coils disconnect, the drive contact separates, work contactor 37 or 38 or 39 disconnects, because work contactor 37 38 or 39 and primary module 1 in controllable silicon 110,111,112 parallel connections, the conducting of controllable silicon this moment, therefore work contactor 37 or 38 or 39 contacts disconnect can not producing and shove, overvoltage.
After work contactor 37 or the 38 or 39 normal excisions, three-phase divides complementary modulus piece 3 transmission signals to send to primary module 1 by a minute benefit communication unit 34, after primary module 1 detects the work contactor 37 or 38 or 39 correct excisions that needs excision, main control unit 13 sends and interrupts the controllable silicon 110 or 111 or 112 that the conducting order disconnects to needs, controllable silicon 110 or 111 or 112 turn-offs when electric current is zero, because of work contactor 37 or 38 or 39 has disconnected, therefore three-phase branch benefit power capacitor need excise mutually and promptly disconnect with power supply, no longer provides reactive power compensation to system.Primary module 1 orders the 5th route contactor 310 of conducting to disconnect again, and the back three-phase that receives orders divides the complementary modulus piece to mend the 5th route contactor 310 coil powers that control unit 32 disconnects correspondence in 3 minutes, and the route contactor disconnects.
Claims (10)
1, a kind of intelligent modularized reactive compensator is characterized in that: described intelligent modularized reactive compensator comprises primary module, and described primary module comprises:
Be used for changing AC power into galvanic main power source unit;
Be used to gather the data acquisition unit of the data of three-phase voltage, three-phase current, zero-sequence current and residual voltage;
Be used for the reactive power according to the real time data computing system needs of gathering, complementary modulus piece, three-phase divide complementary modulus piece and primary module interior capacitor to make up the main control unit of switching altogether to select three-phase; Be used for dividing the main communication unit of complementary modulus piece communication with the common complementary modulus piece of three-phase, three-phase;
Described primary module comprises also that two capacitor powers input skies are opened, thyristor supply input sky is opened, route bus output sky is opened, controllable silicon, the first work contactor, the first via be by contactor, the second work contactor, secondary route contactor, first capacitor, second capacitor;
Bus A, B, C three phase mains are connected with the main power source unit, described main power source unit connects main control unit and data acquisition unit, and described main control unit connects main communication unit, controllable silicon, the first work contactor, the first via by contactor, second work contactor and the secondary route contactor; First capacitor is connected with the first work contactor by contactor with the first via, the first via is by the contactor and the first work contactor parallel connection, second capacitor is connected with the second work contactor with the secondary route contactor, the secondary route contactor and the second work contactor parallel connection, bus A, B, C three phase mains are opened respectively by two skies and are connected with the second work contactor with the first work contactor, the silicon controlled output is opened by route bus output sky and is inserted the route bus, and the silicon controlled output connects the first via by contactor and secondary route contactor simultaneously.
2, intelligent modularized reactive compensator as claimed in claim 1 is characterized in that: described intelligent modularized reactive compensator also comprises three-phase complementary modulus piece altogether, and described three-phase complementary modulus piece altogether comprises:
Be used for changing AC power into the galvanic power subsystem of mending altogether;
Be used for selecting the three-phase common benefit control unit of the capacitor bank switching of complementary modulus piece altogether according to the control signal of primary module;
Be used for common benefit communication unit with the primary module communication;
Described three-phase complementary modulus piece altogether comprises that also the 3rd work contactor, the 4th work contactor, Third Road are by contactor, the 4th route contactor, the 3rd capacitor and the 4th capacitor;
The described power subsystem of mending altogether connects and to mend control unit altogether, and the described control unit of mending altogether connects and mends communication unit, the 3rd work contactor, the 4th work contactor, Third Road altogether by contactor and the 4th route contactor;
The 3rd capacitor is connected with the 3rd work contactor by contactor with Third Road, Third Road is by contactor and the 3rd work contactor parallel connection, the 4th capacitor is connected with the 4th work contactor with the 4th route contactor, the 4th route contactor and the 4th work contactor parallel connection, bus A, B, C three phase mains are opened respectively by two skies and are connected with the 4th work contactor with the 3rd work contactor, and the route bus of primary module is connected with the 4th route contactor by contactor with Third Road by mending the route input switch altogether.
3, intelligent modularized reactive compensator as claimed in claim 1 or 2 is characterized in that: described intelligent modularized reactive compensator comprises that also three-phase divides the complementary modulus piece, and described three-phase divides the complementary modulus piece to comprise:
Be used for changing AC power into galvanic branch and mend power subsystem;
Be used for selecting three-phase to divide the branch of the capacitor bank switching of complementary modulus piece to mend control unit according to the control signal of primary module;
Be used for mending communication unit with the branch of primary module communication;
Described three branch complementary modulus pieces also comprise the 5th work contactor, the 6th work contactor, the 7th work contactor, the 5th route contactor and phase splitting compensation capacitor;
Described branch is mended power subsystem connection branch and is mended control unit, and described branch is mended control unit and connected branch benefit communication unit, the 5th work contactor, the 6th work contactor, the 7th work contactor and the 5th route contactor;
Three-phase divides the benefit capacitor to be connected with the 5th route contactor and the 5th work contactor, the 6th work contactor, the 7th work contactor, the 5th work contactor, the 6th work contactor, the 7th work contactor and the 5th route contactor parallel connection, bus A, B, C three phase mains are opened respectively by three skies and are connected with the 5th work contactor, the 6th work contactor and the 7th work contactor, the route bus of primary module is connected with the 5th route contactor by dividing benefit route input switch, and the zero line of distribution source transmission line is directly mended capacitor with the three-phase branch and is connected.
4, intelligent modularized reactive compensator as claimed in claim 2 is characterized in that: described intelligent modularized reactive compensator comprises 1～100 three-phase complementary modulus piece altogether, and three-phase is parallel with one another between the complementary modulus piece altogether.
5, intelligent modularized reactive compensator as claimed in claim 3 is characterized in that: described intelligent modularized reactive compensator comprises that 1～100 three-phase divides the complementary modulus piece, and three-phase divides between the complementary modulus piece parallel with one another.
6, intelligent modularized reactive compensator as claimed in claim 4, it is characterized in that: described intelligent modularized reactive compensator comprises that 1～100 three-phase divides the complementary modulus piece, three-phase divides between the complementary modulus piece parallel with one another, and described three-phase divides complementary modulus piece and three-phase parallel with one another between the complementary modulus piece altogether.
7, intelligent modularized reactive compensator as claimed in claim 3 is characterized in that: described primary module also comprises demonstration main operation unit, and described demonstration main operation unit connects main control unit; Described three-phase altogether complementary modulus piece comprises that also demonstration mends operating unit altogether, and described demonstration is mended operating unit altogether and connected and mend control unit altogether; Described three-phase divides the complementary modulus piece also to comprise and shows that dividing benefit operating unit, described demonstration to divide the benefit operating unit to connect divides the benefit control unit.
8, intelligent modularized reactive compensator as claimed in claim 3 is characterized in that: described each capacitor connects the miniature circuit breaker protective device that is used for playing overload protective function when overcurrent.
9, intelligent modularized reactive compensator as claimed in claim 3 is characterized in that: described main control unit comprises the active detecting subelement that is used for overvoltage, under-voltage, phase shortage, overcurrent, excess temperature, low temperature and over current fault are carried out active detecting.
10, intelligent modularized reactive compensator as claimed in claim 3 is characterized in that: described main control unit, mend control unit and divide to mend control unit and include and be used for detecting in real time the whether electric capacity operating mode detection sub-unit of normal switching and electric capacitance change of capacitor altogether.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100620282A CN101340097A (en) | 2008-05-17 | 2008-05-17 | Intelligent modularized reactive compensator |
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| CNA2008100620282A CN101340097A (en) | 2008-05-17 | 2008-05-17 | Intelligent modularized reactive compensator |
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| CN101340097A true CN101340097A (en) | 2009-01-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510692B (en) * | 2009-04-01 | 2011-03-16 | 赵世红 | Reactive power compensating controller and method for switching capacitance |
| CN102097811A (en) * | 2011-01-30 | 2011-06-15 | 中国人民解放军后勤工程学院 | Intelligent composite integrated switch |
| CN102593787A (en) * | 2012-02-22 | 2012-07-18 | 西安交通大学 | Low-current disjunction device and disjunction method for direct-current distribution system |
| CN104836124A (en) * | 2015-04-26 | 2015-08-12 | 成都恒力达科技有限公司 | Capacitor reactive power compensation cabinet |
-
2008
- 2008-05-17 CN CNA2008100620282A patent/CN101340097A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510692B (en) * | 2009-04-01 | 2011-03-16 | 赵世红 | Reactive power compensating controller and method for switching capacitance |
| CN102097811A (en) * | 2011-01-30 | 2011-06-15 | 中国人民解放军后勤工程学院 | Intelligent composite integrated switch |
| CN102593787A (en) * | 2012-02-22 | 2012-07-18 | 西安交通大学 | Low-current disjunction device and disjunction method for direct-current distribution system |
| CN102593787B (en) * | 2012-02-22 | 2013-07-17 | 西安交通大学 | Low-current disjunction device and disjunction method for direct-current distribution system |
| CN104836124A (en) * | 2015-04-26 | 2015-08-12 | 成都恒力达科技有限公司 | Capacitor reactive power compensation cabinet |
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Open date: 20090107 |